Blade-protecting knife.



W. R. LAINE.

vBLADE PROTEGTING KNIFE.

APPLICATION FILED APR. 7, 1911.

1 ,024,086. Patented Apr. 23, 1912. l

UNITED ST TES FAT BLADE-PROTECTING KNIFE.

T 0 all whom t may concern.'

Be it known that I, WALTER R. LAINE, a citizen of the United States,residing in the city of Los Angeles, State of California, have inventeda new and useful Blade-Protecting Knife, of which thefollowing is aspecification.

An object of this invention is to provide an improved blade-protectingattachment, applicable to knives differing considerably in design, butmore particularly adapted for use on knives having double-edged bladesof the non-foldable type. This attaclnnent. is adapted to protect thehands of the user and also, when the knife is being sharpened, to guardagainst the edge of the blade being brought into Contact with thesharpening instrument or surface in an improper manner.

Another' object of this invention is to provide an improvedphotographers etching tool the blade of which is capable of beingadjustably set in a variety of positions with relation to the handles.

Referring to the accompanying drawings, which illustrate the invention,Figure 1 is a side elevation of the knife showing the blade-protectingmembers in the extended, or operative, position, one of the side platesbeing broken away to show interior parts more clearly; Fig. 2 is a sideelevation of the reverse side of the knife showing the blade-protectingmembers in the retracted, or inoperative position and also showing theblade adjusted at a different angle; Fig. 3 is a longitudinalmid-section on line ma of Fig. 1; Fig. 4 is an enlarged cross-section,the line of sect-ion being indicated on Fig. 1 by line m4,' Fig. 5 is aside elevation of a blade adapted for use in said knife; Fig. 6 is aperspective view illustrating the use of the blade-protecting arms insharpening a double-edged blade.

Referring in detail to the drawings, the handle may consist of sideplates 1 between which is clamped a spring member 2 by means of two ormore rivets 3. Said member 2 has resilient limbs 4 which operate uponthe blade-protecting arms 5. Said blade-protecting arms 5 are pivotedone near each edge of the handle, by means of rivets, or pins 6 whichalso aid in holding together the side plates 1. Said arms 5 aredesirably square in cross-section near the pivots 6 and provided withright angles upon which the spring limbs 4 act in the usual manner ofSpecication of Letters Patent.

Application led April 7, 1911.

Patented Apr. 23, 1912. Serial No. 619,526.

operating blades of pocket knives to hold said arms yieldingly in theextended position, shown in Fig. 1, or in the retracted position, shownin Fig. 2.

As shown in Fig. 4, the arms 5 are each provided with a round portionupon which is mounted a sleeve 7 Said sleeves are rotatable upon saidarms and are kept in place by a tip 9 on each arm.

As shown in the first three views, at the left end of the handle sideplates l are provided with narrowed end portions 11 which are broughttogether as seen in Fig. 3 to hold a blade 12 by means of a screw 13 andnut 14. Said blade 12 (see Fig. 5) has a shank 15 furnished with an openslot 16 whereby the shank of the blade may be made to pass astride theretaining screw 13. B loosening' the nut 14 (or screw 13) the blade 12may be adjusted to various angles as indicated in Fig. 2. The head ofscrew 13 may be soldered to the side plate extension 11 at that side ofthe knife and the adjustment effected by the nut 14 only. A variety ofblades may be employed if they are all provided with similar shanks. f

In Fig. 6 is illustrated the use of the bladeprotecting arm insharpening a doubleedged blade. In thus using the knife the arm restsupon the strop and the blade and handle are moved in the same manner asin sharpening an ordinary razor. The sleeve 7 protects the other edge ofthe blade from cutting the strop 19. Said sleeve also rot-ates andlessens friction. In order to perform the function of protecting theedges of the blade during sharpening, it is necessary that these bladeprotecting arms be located close to, parallel with, and in substantiallythe same plane with the blade of the knife.

The side plates are recessed at 21 to permit the fingers to grasp thearms 5 to extend the latter.

The herein described knife is well suited to the use of photographersfor an etching tool. The blade being comparatively thin and sharpened atboth edges, there is nothing to obscure the vision of the operator fromthe surface upon which he is operating.

I claim:

1. In a knife, a handle consisting of a member having resilient limbsand a pair of side plates covering said limbs, said plates having sideportions extending laterally beyond said limbs, a double-edged bladeattached to one end of said handle, and a pair of blade-protecting armspivoted to and between the edge portions of said plates, each of saidarms having a heel portion in engagement with one of said resilientlimbs to hold said arm yieldingly in a blade-proteelt-ing position or ina completely retracted position.

2. In a knife, a pair of side plates, an elongated spring member havinga solid portion secured between one end of said side plates and a pairof spring limbs projecting toward the other end of said side plates,said side plates extending laterally beyond said limbsj a blade attachedto the end of the knife toward which said limbs extend, and a pair ofpivoted blade-proteeting arms, said arms having heel portions upon whichsaid limbs operate to hold said arms yieldingly extended along the edgesof the blade adapted to swing into position parallel to' said blade toprotect an edge thereof, and a rotatable sleeve carried by said arm,said sleeve being adapted to operate as an antifriction device insharpening the knife.

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses at Los Angeles, in the county of Los Angelesand State of California, this 29th day of March 1911.

VALTER It. LAINE.

Vitnesses ALBERT H. MERRILL, LILLIAN YOUNG.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

